New employees, employed on far inferior contracts in my experience, don't tend to be so motivated or professional.
Your experience may well be correct, but if people running a company find that to be the case, and the motivation of its new employees is below that which they require, they can make decisions to improve that motivation.
In my experience, companies that have costs that are staggeringly above those of their competitors, wherever in the world they may be, go bust; slowly or quickly. BA were doing it slowly. Iberia appears to be doing it rather more quickly. For both companies, it was/is 'a fight for survival'.